Extend the export options for FitResult

[HKaras]

Currently, the only supported export option from a completed DeerLab FitResult is to pickle. Whilst pickling works well when everything is contained inside a single Python enviroment or computer it is not as good when transfering data between computer and Python versions. I am often finding that DeerLab fits completed on a spectrometer computer are not readable by my laptop.

My proposal would be to expand the FitResult class to contain an export method, as an additional option alongside pickling.

Advantages:

• This method would then export to some heirachial format that would be more easily shared and stored.
• This would also be much better for data archiving as instead of just saving a plot, the associated fit meta-data can also be kept.
• Most people in our community (for better or worse) use Matlab as their main data-processing and ploting method.

Disadvantages:

• Methods are not saved
• UQResult would not be saved (probably could still save the important info but would take more work)

Some potential data format options:

• HDF5 (Widly used in science but requires an extra package/dependency)
• Old-Matlab (Already included in the scipy package)
• New-Matlab (This is just a HDF5 wrapper)
• Numpy / .npz (Designed for multiple arrays, and only readable in Python)

What do other people think?

[stestoll]

Something human-readable like TOML would be desirable. Python as an official TOML package as of version 3.11. Matlab doesn't natively support it, but there is at least one implementation available.